Filming for Prehistoric Park in South Africa took an epic seven weeks, but even so there were times when one Nigel Marven just wasnít enough. On such occasions when there were two crews at work, Jamie Campbell stepped into Nigelís spare clothes and doubled for him. Jamieís usual role on the crew was perhaps more exciting- he is responsible for all the physical effects such as footsteps made by dinosaurs, unusual mechanical contraptions (including a gigantic hoist used to drop meat into the T rex pen) and a series of incredibly destructive enclosure collapses caused by stampeding dinosaurs.